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======  MCP3202 12 Bit A/D Converter ======

The Cubloc has a 10 bit A/D converter. For greater resolution, meaning
greater precision, you can use a chip like the MCP3202. The MCP3202 is a
12 bit A/D converter that supports the SPI protocol. Here we will show you
how to implement this 12 bit A/D converter into your project.

{{ :cubloc:mcp3202_12_bit_a_d_conversion:mcp3202sch.png?nolink |}}

^Pin ^Function ^I/O Direction^Explanation^
|CS |Chip Select |Input |Low for data communication|
|CLK |Clock |Input |Clock signal|
|DI |Data Input |Input |Data input from MCP3202|
|DO |Data Output |Output |Data output from MCP3202|

<code xbasic>
Const Device = CB220
Const iodi = 7
Const iodo = 6
Const ioclk = 5
Const iocs = 4
Dim i As Byte
Dim ad As Integer
Do
  Low iocs
  i = &b1011 'Channel 0
  'i = &b1111 'Channel 1
  Shiftout ioclk,iodi,0,i,4
  ad = Shiftin(ioclk,iodo,3,12)
  High iocs
  Debug Dec ad,cr
  Delay 100
Loop
</code>

The MCP3202 will convert voltage coming into CH0 and CH1 to a digital
value and retain it. SPI communication can then be used to read the value
from the MCP3202.

The voltage measured on the MCP320 CH0 and CH1 pins must not be
greater than the voltage supplied to the MCP3202. The result of the A/D
conversion is displayed in the debug window.

{{ :cubloc:mcp3202_12_bit_a_d_conversion:mcp3202debugscreen.png?nolink |}}